By now, you're probably aware of the world of opportunity that awaits you on eBay. Scores of books have been written on the subject; eBay offers its own classes on the topic; and offshoot businesses have even been created to cater to eBay sellers.

But what does it take to get into the upper echelon of eBay sellers? To join the business owners who sell millions of dollars of products each year? We talked to eight of them to find out exactly that.

Eran Dekel, 28

Secret to Success: ''The problem-solving and analytical capabilities I learned in college [as an engineering major] really prepared me for this type of business. You have to perform both quantitative and qualitative reasoning in determining what products to sell, and [you need to know] how to think outside the box when it comes to completing transactions.''

Secret to Success:''We don't just wait for clients to come to us. We see every single [entity] as a potential client, from the grandma on the street to Nordstrom.''--Ellen Navarro

Chris & Lisa Rush, 30 & 26

HiFiSoundconnection

eBay User ID: hifisoundconnectionLocation: Springfield, MissouriProjected 2006 Sales: $8 millionDescription: Audio and stereo equipment for use at home and in motor vehicles

Secret to Success: ''My demographic is 15- to 25-year-olds, and they are really impatient. We have to cater to people who click on things and make instant purchases. That generation doesn't want to wait. The biggest motivator for us is providing them with good service.''--Chris Rush

Dan Glasure, 31

Secret to Success: ''Our secret has been three-fold: Always trying to get better, always willing to learn new things, and giving the best customer service possible. Also it helps to find a niche, something that you have a knowledge and passion for. For me, it was toy trains! And finding good help is very important to growing your business. Even if you think you can, you cannot do everything yourself.''

Tiffany Tanaka, 24

Secret to Success: ''Many of our customers are older people who want us to sell things for them. But a lot of people are younger than me, and we're just saving time for them. I don't feel many people want to sell on eBay on their own.''

James Anderson, 28

Anderson's Wholesale

eBay User ID: andersonswholesaleLocation: Mesa, ArizonaProjected 2006 Sales: $2 millionDescription: Accessories for iPods and other electronic equipment, as well as ''metaphysical'' items such as swords, chalices, runes and wands

Secret to Success: ''The key to success on eBay is finding items that sell. A seller can have 10,000 items listed on eBay, but if they don't sell, then he/she is losing money (listing fees). To be successful on eBay, a seller has to find items that sell and sell often.''